The present invention relates to a method for preparing ripe persimmon directly on a persimmon tree, comprising: a step (S1) of preparing a sealing cover； a step (S2) of embedding an ethylene generating agent for generating ethylene gas in the sealing cover； a step (S3) of allowing the persimmon hanging on the persimmon tree to be accommodated and sealed inside the sealing cover having the embedded ethylene generating agent； a step (S4) of final-ripening the persimmon inside the sealing cover over a predetermined time period to produce ripe persimmon； and a step (S5) of removing the sealing cover and washing the ripe persimmon, thereby preparing ripe persimmon having superior freshness and quality in a convenient and efficient manner.
